Even if it is set in the printer, the LED lamp does not light up. (There is a description in the manual contained in the box), I would like you to write it on the page of item description of Monotaro. Only yellow displays the following error message "The following ink tank can not be recognized." After opening the side cover and resetting it. Although it seems to recognize correctly, when printing is done with time, the error indication appears again. (Yellow only) Although I'd like to return, this product can not be returned, In the case of a defective product I would like you to respond to returned goods.